GB2356902A - Rolling bearing - Google Patents
Rolling bearing Download PDFInfo
- Publication number
- GB2356902A GB2356902A GB0026962A GB0026962A GB2356902A GB 2356902 A GB2356902 A GB 2356902A GB 0026962 A GB0026962 A GB 0026962A GB 0026962 A GB0026962 A GB 0026962A GB 2356902 A GB2356902 A GB 2356902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vibration
- frequency
- rolling
- frequencies
- inner ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/527—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to vibration and noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
- F16C27/066—Ball or roller bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/06—Drive shafts
Abstract
A rolling bearing, wherein the frequency of vibration occurring based on a waviness present on the rolling surfaces of both inner and outer ring races (8. 10) and rolling elements (11, 11) does not match the rotational frequency itself of a rotating member supported by the rolling bearing nor a frequency component which is an integral multiple of the rotational frequency, or the vibration frequencies of a plurality of types occurring based on the waviness do not match with each other in the natural frequency area of a rotating system which is a rotatably supporting part formed by assembling the rolling bearing, whereby the self-excited vibration of the rolling element becomes difficult to be grown to abnormal vibration even if a special grease is not used to thereby provide the rolling bearing having a sufficient durability and, even if used at low temperatures, preventing abnormal vibration and noise from occurring.
Description
2356902
Title of the Invention
Rolling Bearing Technical Field
A rolling bearing according to this invention is incorporated into a rotation supportig section which is installed outdoors and may be driven at low temperatures, such as for example, a propeller shaft of a vehicle, or a rotation shaft of an electric motor, to thereby prevent the occurrence of harmful vibration or noise even at low temperatures.
Backglound Art In order to dampingly support for example, a middle portion of a propeller shaft of a vehicle under a floor of the vehicle, a rotation supporting unit 1 as shown in FIG. 1 is used. This rotation supporting unit 1 supports a rolling bearing 3 via a buffer material 4 and a housing 5, on the inner diameter side of a support bracket 2.
Of these, the buffer material 4 is formed from a material having a large internal loss, such as rubber, so as to be freely displaceable in the radial direction (vertical direction in FIG. 1) and in the axial direction (lateral direction in FIG. 1). The 1 housing 5 is formed by fitting and combining elements 6a, 6b respectively formed in a cylindrical shape, for fittingly supporting an outer ring 7 of the rolling bearing 3 on the inside.
The rolling bearing 3, being a deep groove ball bearing, comprises an inner ring 9 having an inner ring raceway 8 on an outer peripheral surface thereof, an outer ring 7 having an outer ring raceway 10 on an inner peripheral surface thereof, and a plurality of rolling bodies (balls) 11, 11 arranged rollably between the inner ring raceway 8 and the outer ring raceway 10. The rolling bodies 11, 11 are rollably held by a retainer (not shown), respectively. Also, grease is filled into a space 12 existing between the outer peripheral surface of the inner ring 9 and the inner peripheral surface of the outer ring 7, in which the rolling bodies 11, 11 are arranged, and openings on the opposite ends of this space 12 are respectively sealed by ring-shaped seal rings 13, 13. Such a rolling bearing 3 constitutes the rotation supporting unit 1 described above, in such a manner that the outer ring 7 is supported under the floor of the vehicle via the housing 5 and the buffer material 4, and the inner ring 9 on the outside is fittingly secured to the middle portion of the propeller shaft 14.
The rotation supporting unit 1 for a propeller shaft described above, or a 2 rotation supporting apparatus incorporated in an electric motor installed outside, is used in a low temperature environment in the winter season. In the case of the rotation supporting unit 1 used under such a low temperature environment and lubricated by grease, when the temperature in the portion of the rolling bearing 3 is still low just after startup, abnormal vibration often occurs, and it is known that when the vibration is conspicuous, offensive noise to the ear occurs due to this abnormal vibration. In particular, it is known that under an environment of -10'C or less, the offensive noise occurs conspicuously.
The mechanism in which such a noise occurs was elucidated in a paper "Research Regarding Abnormal Vibration of Ball Bearings" described in Nihon Machinery Society Paper, Vol. 63, No. 616 (Chapter Q, pp 250 - 256, issued in December 1997. According to this paper, the above described mechanism is such that self-excited vibration of the rolling body becomes a cause of the above described abnormal vibration.
For example, if a rotation supporting unit 1 for supporting the middle portion of a propeller shaft 14 as shown in FIG. 1 is considered, when an axial force is applied to the rolling bearing 3 due for example to a change in the operating conditions, external disturbances, or friction in a joint portion disposed at the end of 3 the propeller shaft, axial slippage occurs in each abutting portion between the rolling surface of the respective rolling bodies 11, 11 and the inner ring race 8 and the outer ring race 10. This generates a shear rate in the oil film of the grease intervening in each abutting portion. When this shear rate exceeds a certain value, the shear stress decreases, and the grease acts as a negative resistance. That is to say, there is a relationship expressed by an equation of equilibrium in the lubricant film: dp/dx d-r/dy, between the pressure p of the oil film in the grease and the shear stress -r of the oil film. As is obvious from this relation, as the shear stressTof the oil film decreases, the pressure p of the oil film also decreases, to generate the self-excited vibration of the respective rolling bodies 11, 11 whose rolling surface abuts against the oil film. It is made clear in the paper "Simulation Regarding Nonlinear Vibration of Ball Bearings" described in Nihon Machinery Society Lecture Paper, No. 985-2, pp 269, issued in October 1998, that the frequency of such self-excited vibration becomes a multiple of the rotational frequency.
When the self-excited vibration occurs in the respective rolling bodies 11, 11 with the above described mechanism, the film thickness of the grease existing in the inner ring raceway 8, the outer ring raceway 10 and the rolling surface portion of the respective rolling bodies 11, 11 becomes uneven over the circumference, depending 4 on the traveling tracks based on the rotation movement and revolution movement of the respective rolling bodies 11, 11. In other words, an undulation (bank of grease) is formed by the grease on the surface portion of the inner ring raceway 8 and the outer ring raceway 10 and on the rolling surface portion of the respective rolling bodies 11, 11, respectively. The banks of grease formed in this manner cause radial and axial vibrations, in the same manner as undulations originally existing on the inner ring raceway 8, the outer ring raceway 10 or the rolling surface of the respective rolling bodies 11, 11.
If the frequency of the self-excited vibration of the rolling bodies coincides with the vibration frequency resulting from the banks of grease, vibration is promoted. Moreover, if the frequency of the self-excited vibration of the rolling bodies and the vibration frequency resulting from the banks coincide with the vibration frequency resulting from undulations originally existing (not the banks of grease, but originally existing) on the inner ring raceway 8, the outer ring raceway or the rolling surface of the respective rolling bodies 11, 11, vibration is further promoted to become large. Vibration which has grown in such a manner resonates with a member circunijacent to the rolling bearing 3, thereby resulting in offensive noise to the ear.
Abnormal vibration and noise described above occurs in the first place, based on the self-excited vibration of the rolling bodies and this selfexcited vibration grows due to the banks of grease. Accordingly, in order to eliminate the above described banks of grease or to reduce the strength thereof so that the self excited vibration does not grow to an abnormal vibration, grease having a low viscosity may be used. However, even with such a measure, it is difficult to obtain a sufficient effect at extremely low temperatures, as low as -10 T. Moreover, if grease having such a low viscosity that abnormal vibration does not occur even at such an extremely low temperature is used, the grease tends to leak through the above described respective seal rings 13, 13. Furthermore, grease having a low viscosity has a weak oil film holding power at the rolling contact portion, and in many cases, it is not always satisfactory from the standpoint of lubricating ability.
As a result, when grease having a low viscosity is used, it becomes difficult to favorably maintain the lubricating condition of the rolling bearing 3 for a long period of time.
The present invention addresses the above situation, and realizes a rolling bearing which hinders growth of the self-excited vibration of the rolling bodies to an abnormal vibration, without using a special grease, and which has sufficient 6 durability, and which does not generate abnormal vibration or noise, even if it is used at low temperatures.
Disclosure of the Invention
All the rolling bearings of the present invention comprise a first race having a first raceway, a second race having a second raceway, and Z rolling bodies rollably disposed between the first raceway and the second raceway, as with the aforesaid conventional rolling bearing.
In particular, in the rolling bearing of the present invention, when assumed that n is a positive integer, the frequencies of the vibration generated due to the circumferential undulations of (nZ) waves and (nZ t 1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, are controlled by the relation with the frequencies in other parts.
Claims (4)
1. A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that vibration is generated at frequencies due to the circumferential undulations of (nZ) waves and (nZ 1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the frequencies are out of coincidence with the rotational frequency itself of the rotation member supported by the rolling bearing, and with a frequency component which is a multiple of the rotational frequency.
2. A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that. vibration is generated at kinds of frequencies due to the circumferential undulations of (nZ) waves and (nZ 1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the kinds of frequencies are out of coincidence with each other in the natural frequency domain of a rotation system which is a rotation supporting portion having the rolling bearing incorporated therein.
3. A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that vibration is generated at frequencies due to the circumferential undulations of (nZ) waves and (nZ 1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the frequencies are out of coincidence with the rotational frequency itself of the rotation member supported by the rolling bearing, and with a frequency component which is a multiple of the rotational frequency, and kinds of frequencies generated due to the undulations are out of coincidence with each other in the natural frequency domain of a rotation system which is a rotation supporting portion having the rolling bearing incorporated therein.
4. The rolling bearing of one of Claims 1 to 3, wherein the frequencies or frequency components to be compared with each other have differences at least 1% of the frequencies or frequency components.
-s L4
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19616999 | 1999-07-09 | ||
JP2000201821A JP3975657B2 (en) | 1999-07-09 | 2000-07-04 | Rolling bearing |
PCT/JP2000/004539 WO2001004504A1 (en) | 1999-07-09 | 2000-07-07 | Rolling bearing |
Publications (4)
Publication Number | Publication Date |
---|---|
GB0026962D0 GB0026962D0 (en) | 2000-12-20 |
GB2356902A true GB2356902A (en) | 2001-06-06 |
GB2356902B GB2356902B (en) | 2004-01-14 |
GB2356902C GB2356902C (en) | 2021-02-10 |
Family
ID=26509582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0026962.1A Expired - Lifetime GB2356902C (en) | 1999-07-09 | 2000-07-07 | Rolling bearing |
Country Status (5)
Country | Link |
---|---|
US (2) | US6676297B1 (en) |
JP (1) | JP3975657B2 (en) |
DE (2) | DE10082879C5 (en) |
GB (1) | GB2356902C (en) |
WO (1) | WO2001004504A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005273713A (en) * | 2004-03-23 | 2005-10-06 | Ntn Corp | Fixing structure of rolling bearing |
KR100946513B1 (en) | 2004-11-24 | 2010-03-11 | 현대자동차주식회사 | Center bearing part of propeller shaft for vehicle |
JP4650186B2 (en) * | 2005-09-27 | 2011-03-16 | パナソニック株式会社 | Compressor |
JP6309703B2 (en) * | 2012-03-12 | 2018-04-11 | Ntn株式会社 | Rolling bearing |
US9212946B2 (en) * | 2012-06-08 | 2015-12-15 | General Electric Company | Campbell diagram displays and methods and systems for implementing same |
CN103340642B (en) * | 2013-04-27 | 2015-03-18 | 中国人民解放军北京军区总医院 | Movable CT scanner |
CN106286607A (en) * | 2015-05-29 | 2017-01-04 | Skf公司 | Bearing seal and application thereof |
JP6995792B2 (en) * | 2019-03-04 | 2022-01-17 | 大成建設株式会社 | Building health assessment system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0658849A (en) * | 1992-08-07 | 1994-03-04 | Nippon Seiko Kk | Vibration inspecting apparatus |
JPH11196548A (en) * | 1997-12-26 | 1999-07-21 | Matsushita Electric Ind Co Ltd | Brushless motor |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5228786A (en) * | 1987-12-15 | 1993-07-20 | Koyo Seiko Co., Ltd. | Full type ball bearing for turbochargers |
JP3047764B2 (en) * | 1995-03-10 | 2000-06-05 | 日本精工株式会社 | Rolling bearing |
US5782563A (en) * | 1995-03-10 | 1998-07-21 | Nsk Ltd. | Rolling bearing unit |
US6053638A (en) * | 1997-01-28 | 2000-04-25 | Nsk Ltd. | Ball bearing device for a swing arm |
JP3658994B2 (en) * | 1998-05-15 | 2005-06-15 | 日本精工株式会社 | Method for manufacturing pre-loaded double row rolling bearing device |
-
2000
- 2000-07-04 JP JP2000201821A patent/JP3975657B2/en not_active Expired - Fee Related
- 2000-07-07 DE DE10082879.5A patent/DE10082879C5/en not_active Expired - Lifetime
- 2000-07-07 WO PCT/JP2000/004539 patent/WO2001004504A1/en active Application Filing
- 2000-07-07 US US09/674,850 patent/US6676297B1/en not_active Expired - Lifetime
- 2000-07-07 DE DE10082879T patent/DE10082879C2/en not_active Expired - Lifetime
- 2000-07-07 GB GB0026962.1A patent/GB2356902C/en not_active Expired - Lifetime
-
2003
- 2003-04-30 US US10/425,885 patent/US20030198415A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0658849A (en) * | 1992-08-07 | 1994-03-04 | Nippon Seiko Kk | Vibration inspecting apparatus |
JPH11196548A (en) * | 1997-12-26 | 1999-07-21 | Matsushita Electric Ind Co Ltd | Brushless motor |
Also Published As
Publication number | Publication date |
---|---|
DE10082879T1 (en) | 2001-11-29 |
GB0026962D0 (en) | 2000-12-20 |
GB2356902C (en) | 2021-02-10 |
JP2001082491A (en) | 2001-03-27 |
WO2001004504A1 (en) | 2001-01-18 |
GB2356902B (en) | 2004-01-14 |
DE10082879C2 (en) | 2003-10-23 |
DE10082879C5 (en) | 2020-03-05 |
US6676297B1 (en) | 2004-01-13 |
JP3975657B2 (en) | 2007-09-12 |
US20030198415A1 (en) | 2003-10-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
S27 | Amendment of specification after grant (sect. 27/patents act 1977) |
Free format text: APPLICATION FILED; APPLICATION TO AMEND SPECIFICATION UNDER SECTION 27 FILED ON 09 SEPTEMBER 2019 |
|
PE20 | Patent expired after termination of 20 years |
Expiry date: 20200706 |
|
S27 | Amendment of specification after grant (sect. 27/patents act 1977) |
Free format text: PATENTS FORM 15 GIVING THE COMPTROLLER NOTICE OF OPPOSITION TO THE AMENDMENTS. YOU ALSO NEED TO FILE TWO COPIES OF A STATEMENT SETTING OUT FULLY THE FACTS OF YOUR CASE AND THE RELIEF THAT YOU ARE SEEKING SECTION: 27 PATENT NUMBER: GB2356902 TITLE OF PATENT: ROLLING BEARING INTERNATIONAL CLASSIFICATION: F16C NAME OF PROPRIETOR: NSK LIMITED THESE AMENDMENTS MAY BE VIEWED ON OUR WEBSITE |